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G.. s. GILBERT.

ATTACHMENT FOR BOILER. FURNAGES.

"No, 283.338.' -f PatentefMmgl 14, 1883.

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UNITED STATES GEORGE S. GILBERT, OF BALTIMORE, MARYLAND, ASSIGNOR OFONF-THIRD "IPO THOMAS'M. BRODERICK, OF SAllIE PLAGE.

.ATTACHMENT .FOR BOI LER-FURNAC SPECIFICATION formingpart kof LettersPatent No. 283,338, dated August 14, 1883.

Application filed January 15, 1883. (No model.)

To @ZZ whom t may concern:

Be it known that YI, GEORGE S. GILBERT, cf the city of Baltimore, andState of Maryland, have invented certain Improvements in Attachments forBoiler-Furnaces, of which the following is a specication.

This invention relates to a device to be applied to a practically-closedash-pit of a boiler-furnace, to conduct hot'air and steam under pressureand with a whirling movement to, underneath, and between the grate-bars,for the purposes hereinafter described.

In the further description of the invention which follows reference ismade tothe accompanying drawings, forming a part hereof, and in Which-Figure I is a sectional view of a part of a steam-boiler and the sideWall and other portions Aof the furnace provided with my improvements.Fig. II is a vertical section of the invention on an enlarged scale.Fig. III is a front view of a part of the improvement on an enlargedscale. Y

Similar letters of reference indicate similar parts1 in all the views.

A is the shell ofthe boiler, and B one ofthe side Walls of the furnace.(l O are the grateba-rs, and D is the closed ash-pit or space below thegrate-bars. E is a framebuilt in the Wall B, and F a plate cast orsecured Within the said frame. The plate F has holes or openings a forthe admission of air to the ash-pit, and others, b, through which steamis ejected from a seriesof nozzles, c, which extend from the central andbranch steam-pipes, (respectively denoted by d and e.) The centralsteam-pipe, d, is supported across the outer edge of the frame E, and isclosed at one' end. The other end of the pipe d is attached to a globe,G, to Which the steam-pipe H, leading from the steam-room of the boiler,is attached. The globe Gds provided with an internal thread or spiralprojection, f, to give acircula-r or rotative motion .to steam passingthrough it. This rotative movement of the steam is continued after itescapes from the' nozzles c, notwithstanding that the said nozzles aremuch smaller in diameter than the interior of the globe or any of thepipes between it and the said nozzles. The holes b, o which areconsiderablyT larger than the nozzles c, have a projecting flange,g,`around them over Which conical tubes h are placed.` The conical tubes7L are confined in position by means `of apiece of Wire-Work, z', andstaples 55 k. Steam eject-ed from the nozzles cinto the closed ash-pitI) causes the rapid entrance of air through the openings b and conicalpipes 71, and as the latter devices are providedA With an internalthread or a spiral, Z, similar to the 6o spiral used in the globe G, theair receives a rotative movement as Well as the steam. The result ofthis peculiar movement of the air and steam is that the Whole ash-pit isiilled With a whirling column 0i' combined hot a-ir 65 and vsteam ofgreater force than if supplied as ordinarily, and which not onlysupplies the necessary oxygen to the burning mass of fuel in thefurnace, and also to consume the gases, soot, and cinders, but preventsthe falling of small particles of coal from the spaces bet-Ween thegrate-bars.

The ash-pit is rendered practically closed by means of doors of theusual description, and which are not represented lin the AdraW- 7 5ings.

It will be seen that the great difference in ysize of the nozzles c andthe holes b allows of considerable adjustment of the said nozzles.Consequently the air and steam can be Vdl- 8O rected toward any point inthe furnace Within reasonable limits.

I claim as my invention- In combination with the wall of a closedfurnace ash-pit, an open frame secured Within the said Wall, a platefastened Within the said frame, having openings for the admission of airto the said ash-pit, and other openings surrounded by outwardly-flaringpipes having an interior thread or spiral, and steamnozzles to conduct ajet of steam to the interior of the said daring threaded tubes,substantially as and for the purpose specified.

GEO. S. GILBERT.

' pWitnesses:

EDWARD J. Drees, XV. S. VILKINsoN.

